channel: Fix use after free in channel_do_open_actions()

David Gouletrequested to merge
dgoulet/tor:ticket40345_044_01 into maint-0.4.4

Fortunately, our tor_free() is setting the variable to NULL after so we were in a situation where NULL was always used instead of the transport name.

This first appeared in 894ff2dc and results in basically no bridge with a transport being able to use DoS defenses.

Fixes #40345 (closed)

Signed-off-by: David Goulet dgoulet@torproject.org

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